Update Version Code of Templates to 1801

I think in https://github.com/mybb/mybb/commit/1a41a6495402dfed301738ccbb0472182e051211 and https://github.com/mybb/mybb/commit/cfec40d38a589da4bf13e5ad6df5cd5bf090e2f3 , we must update the version code to 1801...